请问在进行如下之后:(dept_id_pk为表departments的department_id的主键索引)SQL> alter index dept_id_pk monitoring usage;索引已更改。SQL> select * from departments2where department_id like '24%';DEPARTMENT_ID DEPARTMENT_NAMEMANAGER_ID------------- ------------------------------ ----------240 Government SalesSQL> select * from v$object_usage;INDEX_NAMETABLE_NAMEMON USE-------